<template>
    <div class="todo-footer" v-show="total">
      <label>
<!--        <input type="checkbox" :checked="isAll" @change="checkAll"/>-->
        <input type="checkbox" v-model="isAll"/>
      </label>
      <span>
          <span>已完成{{ doneTotal }}</span> / 全部{{ total }}
        </span>
      <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
    </div>
</template>

<script>
export default {
  name: 'MyFooter',
  props:['todos','checkAllTodo','clearAllTodo'],
  computed:{
    total(){
      return this.todos.length;
    },
    doneTotal(){
     return this.todos.reduce((pre,todo)=>{
      return pre+(todo.done?1:0);
     },0)
    },
    isAll:{
      get(){
        return this.doneTotal === this.total && this.total>0;
      },
      set(value){
        this.checkAllTodo(value)
      }
    }
  },
  methods:{
  //   checkAll(e){
  //     this.checkAllTodo(e.target.checked)
  //   }
    clearAll(){
      this.clearAllTodo()
    }
  }
}
</script>
<style scoped>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>